That is a hub, which mounts to the wheel, and on the shaft mounts a sprocket. This allows power to be transferred to the wheels.

All in all the design came out perfectly, and it verifies almost all the other dimensions in my modeling, which means I'm almost ready to send it to the shop for production. But first I need to make a few more tweaks.

Other than that, I'm working on some circuitry still, and waiting on components, but in the mean time, I've got wireless working perfectly up to its current max speed. I'm also about to file my complaint with the fairfield PD too.

Oh, did I mention the New York Times? Well, they may be mentioning me some time very soon!